Optical apparatus and light sensitive device with micro-lens

ABSTRACT

There is provided an optical apparatus including a substrate, a light emitting device, a light sensitive device and a plurality of micro-lenses. The light emitting device is disposed on the substrate and adapted to provide a light beam. The light sensitive device is disposed on the substrate and adapted to receive a light beam reflected from an object, wherein the light sensitive device has a plurality of photosensitive units arranged in matrix. The micro-lenses are disposed above the light sensitive device and respectively opposite to the associated photosensitive units. There is further provided a light sensitive device with micro-lens and a manufacturing method thereof.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. application Ser.No. 14/145,019, filed on Dec. 31, 2013, which claims the prioritybenefit of Taiwan Patent Application Serial Number 102101275, filed onJan. 11, 2013 and Taiwan Patent Application Serial Number 102118898,filed on May 28, 2013, the full disclosure of which are incorporatedherein by reference.

BACKGROUND

1. Field of the Disclosure

This disclosure generally relates to an optical apparatus and, moreparticularly, to an optical apparatus having the advantages of compact,low cost and easy fabrication.

2. Description of the Related Art

FIG. 1A show a schematic diagram of sensing the gesture movement by theconventional optical apparatus and FIG. 1B shows a cross-sectional viewof the optical apparatus 100 of FIG. 1A. Please referring to FIGS. 1Aand 1B together, the optical apparatus 100 includes a package housing110, a light emitting device 120, a light sensitive device 130 and acondensing lens 140. The package housing 110 has a light outlet 112 anda light inlet 114, wherein a light beam L0 generated by the lightemitting device 120 inside the package housing 110 ejects from the lightoutlet 112 and the light sensitive device 130 inside the package housing110 is adapted to receive a light beam L1 reflected from a moving object101 through the light inlet 114 so as to form an image. In addition, thecondensing lens 140 is placed at the light inlet 114 and configured tocollect the light beam L1 reflected by the moving object 101 and toimage on the light sensitive device 130.

The traditional optical apparatus 100 mainly utilizes a singlecondensing lens 140 to image such that a total thickness of the opticalapparatus 100 can not further be decreased. Generally speaking, it ispossible to reduce the total thickness by adopting the Fresnel lens, butthe total cost of the optical apparatus 100 can not be effectivelyreduced.

SUMMARY

The present disclosure provides an optical apparatus having theadvantages of compact, low cost and easy fabrication.

The present disclosure further provides a light sensitive device withmicro-lens and a manufacturing method thereof that may be adapted to theabove optical apparatus and has the same advantages.

Other objects and advantages of the present disclosure will become moreapparent from the following detailed technical features.

In order to achieve one, a part of or all objects above or otherobjects, the present disclosure provides an optical apparatus includinga substrate, a light emitting device, a light sensitive device and alight blocking stack layer. The light emitting device is disposed on thesubstrate and configured to provide a light beam. The light sensitivedevice includes a plurality of photosensitive units arranged in matrixand has a matrix center. The light sensitive device is disposed on thesubstrate and configured to receive a reflected light beam formed by theobject reflecting the light beam. The light blocking stack layer isdisposed on the light sensitive device and includes at least twopatterned metal layers, wherein a plurality of light passages associatedwith the photosensitive units is formed in the at least two patternedmetal layers, the plurality of light passages inclines toward adirection away from the matrix center of the light sensitive device tolimit an incident angle of the reflected light beam impinging on thephotosensitive units, and tilt angles of some light passages arrangeddifferent from tilt angles of other light passages among the pluralityof light passages. The tilt angles of light passages farther from thematrix center of the light sensitive device are larger than the tiltangles of light passages closer to the matrix center of the lightsensitive device thereby increasing sensing efficiency in specificangles.

The present disclosure further provides a light sensitive device withmicro-lens including a plurality of photosensitive units, a lightblocking stack layer and a plurality of micro-lenses. The plurality ofphotosensitive units is arranged in a matrix which has a center. Thelight blocking stack layer includes at least two patterned metal layersforming on the photosensitive units to form a plurality of lightpassages associated with the photosensitive units respectively, whereina part of the plurality of light passages has a tilt angle toward adirection away from the center of the matrix, and tilt angles of somelight passages arranged different from tilt angles of other lightpassages among the part of the plurality of light passages. The tiltangles of the part of the plurality of light passages farther from thecenter of the matrix are larger than tilt angles of the part of theplurality of light passages closer to the center of the matrix therebyincreasing sensing efficiency in specific angles. The plurality ofmicro-lenses is disposed on the light blocking stack layer and oppositeto the light passages, respectively.

The present disclosure further provides a light sensitive deviceincluding a plurality of photosensitive units and a light blocking stacklayer. The plurality of photosensitive units is arranged in a matrix andhaving a matrix center. The light blocking stack layer is disposed onthe plurality of photosensitive units and includes at least twopatterned metal layers, wherein a plurality of light passages associatedwith the photosensitive units is in the at least two patterned metallayers. First light passages among the plurality of light passages arearranged at a center area of the matrix, and the first light passages donot have an tile angle. Second light passages among the plurality oflight passages are arranged outside of the center area and inclinetoward a direction away from the matrix center. Tilt angles of somelight passages arranged different from tilt angles of other lightpassages among the second light passages, and the tilt angles of lightpassages farther from the matrix center are larger than the tilt anglesof light passages closer to the matrix center among the second lightpassages thereby increasing sensing efficiency in specific angles.

In every embodiment of the present disclosure, the optical apparatusfurther includes a light blocking stack layer disposed on the lightsensitive device, wherein the light blocking stack layer includes aplurality of light passages associated with the photosensitive units.The light passages have a tilt angle inclined toward a direction awayfrom a center of the light sensitive device and are configured to limitan incident angle of the reflected light beam impinging on thephotosensitive units.

In every embodiment of the present disclosure, the light blocking stacklayer is positioned between the micro-lenses and the light sensitivedevice.

As mentioned above, the optical apparatus of the present disclosure mayinclude corresponded micro-lenses disposed above the light sensitivedevice so as to prevent the use of the conventional single lens suchthat the fabrication of the optical apparatus is easier and the totalsize of the optical apparatus is reduced thereby effectively reducingthe manufacturing cost of the optical apparatus. Furthermore, in theoptical apparatus of the present disclosure a light blocking stack layeris stacked around adjacent photosensitive units so as to limit theincident angle of reflected light beams impinging on everyphotosensitive unit so as to achieve the function of identifying theobject movement and reduce interferences of stray light or lightleakage, wherein each of the photosensitive units may include one or aplurality of photodiodes.

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects, advantages, and novel features of the present disclosurewill become more apparent from the following detailed descriptions whentaken in conjunction with the accompanying drawings.

FIG. 1A shows a schematic diagram of sensing the gesture movement by theconventional optical apparatus.

FIG. 1B shows a cross-sectional view of the optical apparatus of FIG.1A.

FIG. 2A shows a cross-sectional view of the optical apparatus accordingto an embodiment of the present disclosure.

FIG. 2B shows a partial enlarged diagram of the optical apparatus ofFIG. 2A.

FIG. 2C shows another partial enlarged diagram of the optical apparatusof FIG. 2A.

FIGS. 3A-3D show schematic diagrams of the manufacturing method of thelight sensitive device with micro-lens according to the embodiment ofthe present disclosure.

FIGS. 4A-4E show other schematic diagrams of the manufacturing method ofthe light sensitive device with micro-lens according to the embodimentof the present disclosure.

FIG. 5 shows a flow chart of the manufacturing method of the lightsensitive device with micro-lens according to the embodiment of thepresent disclosure.

FIG. 6 shows another cross-sectional view of the optical apparatusaccording to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENT

The above or other technical contents, characteristics and effectsaccording to the present disclosure will become more apparent from thefollowing detailed description of a preferred embodiment in conjunctionwith the accompanying drawings. It is to be understood that terms ofdirection used herein, such as upward, downward, leftward, rightward,forward and backward, are only used for reference but not used to limitthe present disclosure.

FIG. 2A shows a cross-section view of the optical apparatus according toan embodiment of the present disclosure and FIGS. 2B and 2C show partialenlarged diagrams of the optical apparatus of FIG. 2A. Referring toFIGS. 2A, 2B and 2C together, the optical apparatus 200 of thisembodiment includes a substrate 210, a light emitting device 220, alight sensitive device 230 and a plurality of micro-lenses 240, whereinthe optical apparatus 200 is configured to detect an object 270. Thelight emitting device 220 and the light sensitive device 230 may bedisposed on the substrate 210 and electrically connected to thesubstrate 210 as shown in FIG. 2A. In another embodiment not shown, thelight emitting device 220 and the light sensitive device 230 may berespectively disposed on different substrates, and FIG. 2A is onlyintended to show an embodiment but not to limit the present disclosure.

In this embodiment, the substrate 210 may be a hard circuit board, aflexible circuit board or a lead frame that may be designed differentlyaccording to different requirements and thus FIG. 2A is not to limit thepresent disclosure. In addition, the light emitting device 220 isadapted to provide a light beam L0, wherein the light emitting device220 may include a light emitting diode and the light beam L0 provided bythe light emitting device 220 may have a wavelength of invisible light,e.g. infrared light or UV light. The infrared light may be used as anexample herein, but the present disclosure is not limited thereto. Inother embodiments, the light emitting device 220 may be other suitableactive light sources. In this embodiment, the light sensitive device 230may include a CCD image sensor or a CMOS image sensor, wherein a CMOSsensor is used as an embodiment herein. The light sensitive device 230is adapted to receive a reflected light beam L1 formed by the object 270reflecting the light beam L0.

Specifically speaking, the light sensitive device 230 includes aplurality of photosensitive units 232 arranged in matrix, wherein eachof the photosensitive units 232 may include at least one photodiodeconfigured to convert optical energy to electric signals, and a lightblocking stack layer 250 is staked around the photosensitive units 232.The light blocking stack layer 250 is disposed on the light sensitivedevice 230, wherein the light blocking stack layer 250 includes aplurality of light passages C (as shown in FIG. 2C) respectivelyassociated with the photosensitive units 232. The light passages C havea tilt angle θ inclined toward a direction away from a center of thelight sensitive device 230 and are configured to limit an incident angle(i.e. the incident angle is equal to the tilt angle) of the reflectedlight beam L1 impinging on the photosensitive units 232. Accordingly,the light sensitive device 230 may achieve the function of identifyingthe object movement and decrease interferences from stray light or lightleakage as shown in FIGS. 2B and 2C. More specifically speaking, thelight blocking stack layer 250 may include a transparent material layer252 and an opaque stack layer 254, wherein the transparent materiallayer 252 is covered on the photosensitive units 232 to be served as thelight passages C through which the reflected light beam L1 impinges onthe photosensitive units 232, and the opaque stack layer 254 inside thelight blocking stake layer 250 is configured to limit the incident angleθ of the reflected light beam L1 impinging on the photosensitive units232. The light blocking stack layer 250 may be manufactured by thetraditional semiconductor etching process and thus details thereof arenot described herein. The opaque stack layer 254 may be made of metal ornon-mental materials (the metal material is used as an embodimentherein). In addition, in order to prevent the reflected light beam L1from being reflected by the opaque stack layer 254 during impinging ontothe photosensitive units 232, the opaque stack layer 254 is preferablymade of light absorption materials. In addition, in order to allow thephotosensitive units 232 to receive the reflected light beam L1 from aspecific angle thereby increasing the sensing efficiency, the tilt angleθ of the light passages is preferable positively correlated with adistance between the light passages and a center of the light sensitivedevice 230 such that the incident angle of the reflected light beam L1received by the photosensitive units 232 is positively correlated with adistance between the light passages and a center of the light sensitivedevice 230; that is, the light passages closer to the edge of the lightsensitive device 230 may have a larger tilt angle θ inclined outwardlysuch that the associated photosensitive units 232 may receive thereflected light beam L1 having a larger incident angle.

In addition, the micro-lenses 240 are disposed above the light sensitivedevice 230 and respectively opposite to the photosensitive units 232 asshown in FIG. 2A; that is, if the micro-lenses 240 have good lightguiding effect, the light blocking stack layer 250 may not beimplemented. When the optical apparatus 200 of this embodiment includesthe light blocking stack layer 250, the micro-lenses 240 are disposed onthe light blocking stack layer 250 and respectively opposite to thelight passages C such that the light blocking stack layer 250 is betweenthe micro-lenses 240 and the light sensitive device 230. Morespecifically, at least one micro-lens having different angles may bedisposed above each of the photosensitive units 232 of this embodimentsuch that different photosensitive units 232 may have different lightreceiving angles as shown in FIG. 2B. In this manner, a traditionallyused single large lens is no longer necessary. The light sensitivedevice 230 may effectively detect the movement of the object, the totalthickness or size of the optical apparatus 200 is effectively reduced,the manufacturing cost is lowered and the fabrication becomes easier(without the fabrication of the single lens). In other words, theoptical apparatus 200 may include corresponded micro-lenses 240 disposedabove the light sensitive device 230 so as to prevent the use of theconventional single lens thereby facilitating the fabrication, reducingthe total size and manufacturing cost effectively.

In the embodiment of FIG. 2B, each photosensitive unit 232 is shown tobe associated with one micro-lens 240 and one light passage. In anotherembodiment, as shown in FIG. 2C, when the photosensitive units 232 havea larger size, each photosensitive unit 232 may be associated with aplurality of identical or different micro-lenses 240 and a plurality oflight passages C. For example, FIG. 2C shows that each photosensitiveunit 232 is associated with two micro-lenses 240 and two light passagesC so as to solve the difficulty of manufacturing a larger micro-lens 240on a larger photosensitive unit 232 and improve the signal intensity.Specifically, the manufactured size of the micro-lenses 240 is small andif the photosensitive units 232 have a larger size, more than onemicro-lenses 240 may be formed above one photosensitive unit 232 so asto allow the light to be effectively collected. In other words, thenumber of the micro-lenses 322 and the light passages C formed above onephotosensitive unit 232 may be determined according to the size of thephotosensitive units 232 as well as the manufacturing accuracy offorming the micro-lenses 232 above the photosensitive units 232. Theabove descriptions are only intended to illustrate but not to limit thepresent disclosure. For example in one embodiment, when eachphotosensitive unit 232 is associated with a plurality of light passagesC and a plurality of micro-lenses 240, the light passages C opposite tothe same photosensitive unit 232 may have identical tilt angles θ andthe micro-lenses 240 opposite to the same photosensitive unit 232 mayhave identical light collecting angles so as to limit the incident angleof the reflected light beams L1 to be identical as shown in FIG. 2C.

In addition, the optical apparatus 200 may further include a packagehousing 260, wherein the package housing 260 may be disposed on thesubstrate 210 and have a light outlet 262 and a light inlet 264. In thisembodiment, a first accommodation space S1 and a second accommodationspace S2 are formed when the package housing 260 is disposed on thesubstrate 210, wherein the light emitting device 220 may be contained inthe first accommodation space S1 and the light sensitive device 230 maybe contained in the second accommodation space S2 as shown in FIG. 2A.The light beam L0 provided by the light emitting device 220 in the firstaccommodation space S1 propagates outward through the light outlet 262and the light sensitive device 230 in the second accommodation space S2may receive the reflected light beam L1 reflected by an object 270through the light inlet 264. In should be mentioned that the packagehousing 260 may be integrated with or physically separated from thesubstrate 210 according to different manufacturing processes and thedrawing shown herein is only intended to illustrate but not to limit thepresent disclosure.

FIGS. 3A-3D show schematic diagrams of the manufacturing method of thelight sensitive device with micro-lens of FIG. 2B. Referring to FIG. 3Aat first, a light sensitive device 230 mentioned above is provided atfirst, wherein the light sensitive device 230 may be a CMOS image sensorand include a plurality of photosensitive units 232 arranged in matrix,e.g. a rectangular matrix having a oblong shape or a square shape. Next,a protection layer 310 is formed on the light sensitive device 230 asshown in FIG. 3B, wherein the protection layer 310 may be made of thedielectric material. Then, at least two layers of patterned metal layersare formed on the protection layer 310 so as to form a plurality oflight passages that are associated with the photosensitive units 232respectively. As mentioned above a part of the light passages C (e.g.the light passages not at a center of the light sensitive device 230)may have a tilt angle inclined toward a direction away from a center ofthe light sensitive device 230, and the value of the tilt angle ispositively correlated with a distance between the light passages and thecenter of the light sensitive device 230. In addition, the lightpassage(s) C located at the center (e.g. a matrix center of thephotosensitive units 232) of the light sensitive device 230 may not havethe tilt angle and are configured to receive the reflected light beam L1from a normal direction of the light sensitive device 230 as shown inFIGS. 2B and 2C.

The method of forming the patterned metal layers may be, for example,forming a first patterned metal layer 320 as shown in FIG. 3B, whereinthe first patterned metal layer 320 may be formed by using thetraditional semiconductor photolithography technique; and then forming asecond patterned metal layer 330 on the first patterned metal layer 320as shown in FIG. 3C, wherein the second patterned metal layer 330 may beformed by using the traditional semiconductor photolithographytechnique. Then, the steps of stacking the first patterned metal layer320 and second patterned metal layer 330 may be repeated sequentially soas to form the embodiment shown in FIG. 3D. Finally, the micro-lenses240 mentioned above are formed above the light sensitive device 230 andopposite to the light passages respectively. In this way, the process offorming the micro-lenses 240 above the light sensitive device 230 asshown in FIG. 2B is accomplished. It should be mentioned that thestacked first patterned metal layers 320 and second patterned metallayers 330 are served as the opaque stack layer 254 aforementioned andthe transparent material layer 252 is served as the light passages C.

In addition, referring to FIGS. 4A-4E, they show other schematicdiagrams of the manufacturing method of the light sensitive device withmicro-lens of FIG. 2B in which a light sensitive device 230 is alsoprovided at first (FIG. 4A). Next, a protection layer 310 is formed onthe light sensitive device 230. Then, a transparent material layer 252(FIG. 4B), an opaque stack layer 320 (FIG. 4C), another transparentmaterial layer 252 (FIG. 4D) and another opaque stack layer 330 (FIG.4E) are sequentially formed, and the structure of FIG. 3D can be formedby repeatedly stacking these layers. Finally, a plurality ofmicro-lenses 240 are formed on the light blocking stack layer 250 so asto accomplish the light sensitive device with micro-lens of the presentdisclosure. In this embodiment, the transparent material layer 252, theopaque stack layer 320, the transparent material layer 252 and theopaque stack layer 330 may also be formed by using the traditionalsemiconductor photolithography technique and thus details thereof arenot repeated therein.

In a word, the manufacturing method of the light sensitive device withmicro-lens of this embodiment includes the steps of: providing a lightsensitive device (Step S₄₁); forming a protection layer on the lightsensitive device (Step S₄₂); forming at least two patterned metal layerson the protection layer so as to form a plurality of light passages(Step S₄₃); and forming a plurality of micro-lenses opposite to thelight passages (Step S₄₄) as shown in FIG. 5, wherein details of thisembodiment are shown in FIGS. 3A-3D, FIGS. 4A-4E and the correspondingdescriptions thereof and thus details are not repeated herein. It shouldbe mentioned that although the first patterned metal layer 320 and thesecond patterned metal layer 330 are shown to have different shapes andsizes in FIGS. 3A-3D and FIGS. 4A-4E, but the present disclosure is notlimited thereto. In another embodiment, the first patterned metal layer320 and the second patterned metal layer 330 may substantially beidentical.

It should be mentioned that although FIGS. 2B and 2C show 5 layers ofthe opaque stack layers 254, the present disclosure is not limitedthereto. The opaque stack layers 254 may be 2-5 layers. The layer numberof the opaque stack layers 254 may be determined according to thedetectable range, the size of photosensitive units, the shape ofmicro-lenses and the system parameter.

In FIGS. 2B and 2C, the micro-lenses 240 are spherical asymmetric and agravity center of a part of the micro-lenses (i.e. the micro-lenses notat the center of the light sensitive device 320) preferably has anoffset from the associated photosensitive units 232 toward a directionaway from a center of the light sensitive device 230 to effectivelyguide the reflected light beam L1 onto the photosensitive units 232,wherein corresponding to the tilt angle θ of the light passages C, theoffset is also positively correlated with a distance between themicro-lenses 240 and the center of the light sensitive device 230.

In another embodiment, referring to FIG. 6, the micro-lenses 240 may bespherical symmetry, and a gravity center (i.e. the sphere center herein)of the micro-lenses 240 preferably has an offset from the associatedphotosensitive units 232 toward a direction away from a center of thelight sensitive device 230, e.g. the offsets D1 and D2 shown in FIG. 6.Similarly, corresponding to the tilt angle θ of the light passages C,the offset is also positively correlated with a distance between themicro-lenses 240 and the center of the light sensitive device 230, e.g.D1>D2, so as to limit the incident angles of the reflected light beam L1impinging on the photosensitive units 232, e.g. incident angle θ1>θ2.

As mentioned above, the optical apparatus according to the embodiment ofthe present disclosure (as FIG. 2A) may include correspondedmicro-lenses disposed above the light sensitive device so as to preventthe use of the conventional single lens such that the fabrication of theoptical apparatus is easier and the total size of the optical apparatusis reduced thereby effectively reducing the manufacturing cost of theoptical apparatus. Furthermore, in the optical apparatus a lightblocking stack layer is stacked around adjacent photosensitive units (asFIGS. 2B, 2C and 6) so as to limit the incident angle of reflected lightbeams impinging on every photosensitive unit so as to achieve thefunction of identifying the object movement and reduce interferences ofstray light or light leakage.

Although the disclosure has been explained in relation to its preferredembodiment, it is not used to limit the disclosure. It is to beunderstood that many other possible modifications and variations can bemade by those skilled in the art without departing from the spirit andscope of the disclosure as hereinafter claimed. Furthermore, anyembodiment or claim of the present invention is not necessary to achieveall objects, advantages and novel features disclosed herein. Meanwhile,the summary and title are only for searching of patent documents but notto limit the scope of claims of the present disclosure.

What is claimed is:
 1. An optical apparatus, configured to detect anobject, the optical apparatus comprising: a substrate; a light emittingdevice disposed on the substrate and configured to provide a light beam;a light sensitive device comprising a plurality of photosensitive unitsarranged in matrix and having a matrix center, the light sensitivedevice disposed on the substrate and configured to receive a reflectedlight beam formed by the object reflecting the light beam; and a lightblocking stack layer disposed on the light sensitive device andincluding at least two patterned metal layers, wherein a plurality oflight passages associated with the photosensitive units is formed in theat least two patterned metal layers, the plurality of light passagesinclines toward a direction away from the matrix center of the lightsensitive device to limit an incident angle of the reflected light beamimpinging on the photosensitive units, and tilt angles of some lightpassages arranged different from tilt angles of other light passagesamong the plurality of light passages, wherein the tilt angles of lightpassages farther from the matrix center of the light sensitive deviceare larger than the tilt angles of light passages closer to the matrixcenter of the light sensitive device thereby increasing sensingefficiency in specific angles.
 2. The optical apparatus as claimed inclaim 1, further comprising a plurality of micro-lenses disposed abovethe light sensitive device and respectively opposite to thephotosensitive units.
 3. The optical apparatus as claimed in claim 2,wherein the light blocking stack layer is between the micro-lenses andthe light sensitive device.
 4. The optical apparatus as claimed in claim2, wherein the micro-lenses are spherical asymmetry.
 5. The opticalapparatus as claimed in claim 2, wherein a gravity center of themicro-lenses has an offset from the associated photosensitive unitstoward a direction away from the matrix center of the light sensitivedevice.
 6. The optical apparatus as claimed in claim 5, wherein theoffset is positively correlated with a distance between the micro-lensesand the matrix center of the light sensitive device.
 7. The opticalapparatus as claimed in claim 1, wherein the light blocking stack layercomprises at least two transparent material layers and at least twoopaque stack layers, and the transparent material layers are configuredas the light passages and the at least two opaque stack layers areconfigured as the at least two patterned metal layers.
 8. The opticalapparatus as claimed in claim 7, wherein the opaque stack layers aremade of light absorbing material.
 9. The optical apparatus as claimed inclaim 1, wherein each of the photosensitive units is associated with onelight passage.
 10. The optical apparatus as claimed in claim 1, whereineach of the photosensitive units is associated with more than one lightpassage, and the incident angles of the reflected light beam limited bythe light passages associated with the same photosensitive unit areidentical.
 11. The optical apparatus as claimed in claim 1, wherein eachof the photosensitive units comprises at least one photodiode.
 12. Alight sensitive device with micro-lens, the light sensitive devicecomprising: a plurality of photosensitive units arranged in a matrixwhich has a center; a light blocking stack layer including at least twopatterned metal layers forming on the photosensitive units to form aplurality of light passages associated with the photosensitive unitsrespectively, wherein a part of the plurality of light passages has atilt angle toward a direction away from the center of the matrix, andtilt angles of some light passages arranged different from tilt anglesof other light passages among the part of the plurality of lightpassages, wherein the tilt angles of the part of the plurality of lightpassages farther from the center of the matrix are larger than tiltangles of the part of the plurality of light passages closer to thecenter of the matrix thereby increasing sensing efficiency in specificangles, and a plurality of micro-lenses disposed on the light blockingstack layer and opposite to the light passages, respectively.
 13. Thelight sensitive device as claimed in claim 12, wherein a gravity centerof the micro-lenses has an offset from the associated photosensitiveunits toward a direction away from the center of the matrix.
 14. Thelight sensitive device as claimed in claim 13, wherein the offset ispositively correlated with a distance between the micro-lenses and thecenter of the matrix.
 15. A light sensitive device, comprising: aplurality of photosensitive units arranged in a matrix and having amatrix center; and a light blocking stack layer disposed on theplurality of photosensitive units and including at least two patternedmetal layers, wherein a plurality of light passages associated with thephotosensitive units is in the at least two patterned metal layers,first light passages among the plurality of light passages are arrangedat a center area of the matrix, and the first light passages do not havean tile angle, second light passages among the plurality of lightpassages are arranged outside of the center area and incline toward adirection away from the matrix center, and tilt angles of some lightpassages arranged different from tilt angles of other light passagesamong the second light passages, wherein the tilt angles of lightpassages farther from the matrix center are larger than the tilt anglesof light passages closer to the matrix center among the second lightpassages thereby increasing sensing efficiency in specific angles. 16.The light sensitive device as claimed in claim 15, further comprising aplurality of micro-lenses disposed above the plurality of photosensitiveunits and respectively opposite to the photosensitive units.
 17. Thelight sensitive device as claimed in claim 16, wherein the lightblocking stack layer is between the micro-lenses and the plurality ofphotosensitive units.
 18. The light sensitive device as claimed in claim16, wherein the micro-lenses are spherical symmetry and a gravity centerof the micro-lenses has an offset from the associated photosensitiveunits toward a direction away from the matrix center.
 19. The lightsensitive device as claimed in claim 18, wherein the offset ispositively correlated with a distance between the micro-lenses and thematrix center.
 20. The light sensitive device as claimed in claim 15,wherein each of the photosensitive units is associated with at least oneof the plurality of light passages.